Exemple #1
0
void CCRenderPass::appendQuadsForRenderSurfaceLayer(CCLayerImpl* layer)
{
    // FIXME: render surface layers should be a CCLayerImpl-derived class and
    // not be handled specially here.
    CCRenderSurface* surface = layer->renderSurface();
    bool isOpaque = false;
    OwnPtr<CCSharedQuadState> sharedQuadState = CCSharedQuadState::create(surface->drawTransform(), surface->drawTransform(), surface->contentRect(), surface->clipRect(), surface->drawOpacity(), isOpaque);
    m_quadList.append(CCRenderSurfaceDrawQuad::create(sharedQuadState.get(), surface->contentRect(), layer, surfaceDamageRect()));
    m_sharedQuadStateList.append(sharedQuadState.release());
}
void LayerRendererChromium::drawLayersInternal()
{
    if (viewportSize().isEmpty() || !rootLayer())
        return;

    TRACE_EVENT("LayerRendererChromium::drawLayers", this, 0);
    CCLayerImpl* rootDrawLayer = rootLayer();
    makeContextCurrent();

    if (!rootDrawLayer->renderSurface())
        rootDrawLayer->createRenderSurface();
    rootDrawLayer->renderSurface()->setContentRect(IntRect(IntPoint(), viewportSize()));

    rootDrawLayer->setScissorRect(IntRect(IntPoint(), viewportSize()));

    CCLayerList renderSurfaceLayerList;
    renderSurfaceLayerList.append(rootDrawLayer);

    m_defaultRenderSurface = rootDrawLayer->renderSurface();
    m_defaultRenderSurface->clearLayerList();

    {
        TRACE_EVENT("LayerRendererChromium::drawLayersInternal::calcDrawEtc", this, 0);
        CCLayerTreeHostCommon::calculateDrawTransformsAndVisibility(rootDrawLayer, rootDrawLayer, m_zoomAnimatorTransform, m_zoomAnimatorTransform, renderSurfaceLayerList, m_defaultRenderSurface->layerList(), &m_layerSorter, m_capabilities.maxTextureSize);
    }

    // The GL viewport covers the entire visible area, including the scrollbars.
    GLC(m_context.get(), m_context->viewport(0, 0, viewportWidth(), viewportHeight()));
    m_windowMatrix = screenMatrix(0, 0, viewportWidth(), viewportHeight());

    // Bind the common vertex attributes used for drawing all the layers.
    m_sharedGeometry->prepareForDraw();

    GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
    GLC(m_context.get(), m_context->disable(GraphicsContext3D::DEPTH_TEST));
    GLC(m_context.get(), m_context->disable(GraphicsContext3D::CULL_FACE));

    useRenderSurface(m_defaultRenderSurface);

    if (m_zoomAnimatorTransform.isIdentity())
        // Clear to blue to make it easier to spot unrendered regions.
        m_context->clearColor(0, 0, 1, 1);
    else
        // Clear to grey, as zoom animation may leave unrendered regions.
        // FIXME(wjmaclean): Render some interesting texture in unrendered regions.
        m_context->clearColor(0.25, 0.25, 0.25, 1);
    m_context->colorMask(true, true, true, true);
    m_context->clear(GraphicsContext3D::COLOR_BUFFER_BIT);

    GLC(m_context.get(), m_context->enable(GraphicsContext3D::BLEND));
    GLC(m_context.get(), m_context->blendFunc(GraphicsContext3D::ONE, GraphicsContext3D::ONE_MINUS_SRC_ALPHA));
    GLC(m_context.get(), m_context->enable(GraphicsContext3D::SCISSOR_TEST));

    // Update the contents of the render surfaces. We traverse the array from
    // back to front to guarantee that nested render surfaces get rendered in the
    // correct order.
    for (int surfaceIndex = renderSurfaceLayerList.size() - 1; surfaceIndex >= 0 ; --surfaceIndex) {
        CCLayerImpl* renderSurfaceLayer = renderSurfaceLayerList[surfaceIndex].get();
        CCRenderSurface* renderSurface = renderSurfaceLayer->renderSurface();
        ASSERT(renderSurface);

        renderSurface->setSkipsDraw(true);

        // Render surfaces whose drawable area has zero width or height
        // will have no layers associated with them and should be skipped.
        if (!renderSurface->layerList().size())
            continue;

        // Skip completely transparent render surfaces.
        if (!renderSurface->drawOpacity())
            continue;

        if (useRenderSurface(renderSurface)) {
            renderSurface->setSkipsDraw(false);

            if (renderSurfaceLayer != rootDrawLayer) {
                GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
                GLC(m_context.get(), m_context->clearColor(0, 0, 0, 0));
                GLC(m_context.get(), m_context->clear(GraphicsContext3D::COLOR_BUFFER_BIT));
                GLC(m_context.get(), m_context->enable(GraphicsContext3D::SCISSOR_TEST));
            }

            const CCLayerList& layerList = renderSurface->layerList();
            for (unsigned layerIndex = 0; layerIndex < layerList.size(); ++layerIndex)
                drawLayer(layerList[layerIndex].get(), renderSurface);
        }
    }

    if (m_headsUpDisplay->enabled()) {
        GLC(m_context.get(), m_context->enable(GraphicsContext3D::BLEND));
        GLC(m_context.get(), m_context->blendFunc(GraphicsContext3D::ONE, GraphicsContext3D::ONE_MINUS_SRC_ALPHA));
        GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
        useRenderSurface(m_defaultRenderSurface);
        m_headsUpDisplay->draw();
    }

    GLC(m_context.get(), m_context->disable(GraphicsContext3D::SCISSOR_TEST));
    GLC(m_context.get(), m_context->disable(GraphicsContext3D::BLEND));
}